Uneven, Uneven, ConchoidalAnthony et al, Handbook of mineralogy (2001)
Uneven, torn surfaces, (e.g. fractured metals)., Uneven, Gemstones (2009), torn surfaces, (e.g. fractured metals).
Ca 5(PO 4) 3FAnthony et al , Handbook of mineralogy (2001)
FeO(OH)Arthur Thomas , Gemstones (2009)